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Ruger .44 Carbine, Security-Six, Service-Six, Mini-14, .30 Carbine Blackhawk
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That is carbon from a fluted chamber. Does not hurt a thing, for reloading it cleans right off.
My Cetme does that to 7.62 brass.

HK's have fluted chambers.
HK MP5, P7's...... probably others.
 
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